Experiments were conducted to define the optimum weld geometry for producing maximum fatigue strength in fillet welds. To accomplish the aim, the fatigue strength of 12 different toe patterns produced using E460TM steel plate was measured using four-point bend tests. The welds were produced in either the flat or vertical upwards position using MIG and MMA processes and a number of different filler metals. A Wohler's curve was plotted for each pattern studied in order to evaluate and compare the fatigue behaviour of the various types of toes. The results showed that it was possible to obtain toe radii with a size ranging from 0.6 to 3 mm with the same scatter in the measured values. The endurance limit of the fillet welds made in the flat position was independent of the welding process or the filler metal.